Miscibility and carrier transport properties in binary blend system of non-peripherally octa-hexyl-substituted phthalocyanine analogues

• Published in: Organic electronics Vol. 44; pp. 67 - 73
• Main Authors: Nakagawa, Dai, Nakano, Chika, Ohmori, Masashi, Itani, Hiromichi, Shimizu, Yo, Fujii, Akihiko, Ozaki, Masanori
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-05-2017
• Subjects: Carrier mobility; Liquid crystal; Miscibility; Organic semiconductor; Miscibility; Liquid crystal; Carrier mobility; Organic semiconductor
• ISSN: 1566-1199; 1878-5530
• DOI: 10.1016/j.orgel.2017.02.003

The thermal phase transition and charge carrier mobility in binary mixtures of the liquid crystalline phthalocyanine 1,4,8,11,15,18,22,25-octahexylphthalocyanine (C6PcH2) and its analogue 1,4,8,11,15,18,22,25-octahexyltetrabenzotriazaporphyrin (C6TBTAPH2) were studied, and the relationship between the miscibility and carrier transport properties is discussed. The phase diagram for binary mixtures consisting of C6PcH2 and C6TBTAPH2 was determined by differential scanning calorimetry and X-ray diffraction analysis. The hole mobilities in the columnar mesophase and crystal phase were evaluated by the time-of-flight technique. The complete miscibility in the columnar mesophase and the limited miscibility in the crystal phase were clarified. The dependence of the hole mobility on the blend ratio of C6PcH2 to C6TBTAPH2 is discussed by taking the molecular packing structure into consideration.
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•Thermal behavior in the binary blend system of LC phthalocyanine analogues was investigated.•The complete miscibility in the LC phase of the binary blend system was clarified.•The dominant crystal structure in crystal phase changed depending on the blend ratio.•High hole mobility was kept in the miscible binary blend of LC phthalocyanine analogues.